He can amend his taxes for the past 3 years to claim you on those tax returns. The IRS only allows you to amend back that far. They will not allow you to go back 5 years to amend. Here is a link to the Amend process in TurboTax <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed"...>
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